One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,7)(9,10,13,16)(11,14,17,21)(12,19,20,15)(18,24,23,22)(25,26)(27,33)(28,37)(29,31)(30,36)(32,35)(34,39)(38,40)(1,2,4,5)(3,7,8,6)(11,17)(12,20)(14,21)(15,19)(27,34)(30,38)(33,39)(36,40)(9,11,13,17)(10,14,16,21)(12,18,20,23)(15,22,19,24)(25,27,35,40,29,34,28,36)(26,30,37,39,31,38,32,33)(1,3,4,8)(2,6,5,7)(11,17)(14,21)(18,23)(22,24)(9,12,13,20)(10,15,16,19)(11,18,17,23)(14,22,21,24)(26,31)(30,38)(32,37)(33,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.